Harrow



Sept. 18, 1934. A, c. LINDGRIV-:N 9739813 HARROW Filed June 8, 1933 2 Sheets-Sheet 2 .305 the ends 12 of the bars 11.

50.11;@ the draft bar at 17a.

Patented Sept. 18, 1934 v 1,973,988.; HARROW Aiexus C. Lindgren, Chicago,'1ll.,` assignorto International Harvester Company, a corporation i ofr New-Jersey Application June 8, iosa-sensing. 674,915

3 claims. (o1. 551-104) --The invention relates to narrows of the pivoted toothbar typeand, more specifically, to the frame constructionthereof. Q f -f I The maincbjeCt ofthe invention is to simplify f and improve the structure of multiple unit spring tooth harrows of the pivoted tooth bar type by eliminating certain `of the central longitudinal runner bars ordinarily employed in-suoh narrows, and to provide a fiexible and easily controlled narrow withoutmaking use of separate narrow frames for each unit as has heretofore been the practice. Y v

The novel construction by which the foregoing and. other objects andimproved features are at-v tained is described hereinafter and illustrated in the accompanying drawings, where:

Figure 1 is a plan view of a narrow embodying the invention;

Figure 2 is a side elevation;

Figure 3 is a detail view on line 3-3 of Figure 1; and,

Figure 4 is a detail View on line 4--4 of Figure 1.

In the present disclosure there is illustrated a double narrow comprising two narrow units or 25,1; sections and a unitary draft frame. The draft frame has a transversely extended draft bar 10,

forwardly converging bars 11 having the forward ends 12 disposed in parallel, spaced relation, and a central tongue or slide bar 13 extending between A bracket comprising Vertical plates 14 connects the ends 12 of the converging bars. The draft bar has attached to it three uniformly spaced runner bars trailing y loosely therefrom. These consist of two outer 3.051 runner bars 15, the forward ends of which are bent upwardly and pivotally connected at 16 to the ends of the draft bar 10, and a single intermediate or central runner bar 1'7 identical in form to the outer bars and pivotally connected All three bars are, therefore, connected on the same transverse axis. The runner bars are preferably formed of angle iron sections with one web upright and the other web N forming a runner-like surface on which the harrow is supported when the teeth are raised to transport position. The runner bars are provided with upright bearing brackets 18 fixed to the vertical web of the runner bars and arranged in transverse alignment on the respective bars in v--spaced relation along the length of these bars,

as illustrated. These brackets carry sets of aXially aligned tooth carrying bars 19 which are illustrated as arranged in pairs with the ends of `the respective bars of each pair pivoted on the @PATENTforties outer runner 'members V15 and; thesingle central l u To effect an offset pivotal connection between the tooth bars and the brackets on the runnery bars, the ends of the runner bars are provided with angular extensions 20 at each end, the vertical arms of which are loosely pivoted on trans-Y versepins 21 on the brackets 18. As each bracket onthe central runner member 17 serves to sup# port the adjacent innerends of a pair of tooth bars, these brackets'are provided with longer pins 22 projecting from each side of the bracket for reception,oftherespective angular extensions 20, as illustrated by Figure 3. The tooth bars carry uniformly spaced narrow teeth 23, which'are here illustrated as spring teeth. These are arranged in staggered relation on the respective bars, and, to effect uniformity in the staggering of the teeth, one of the rear tooth bars 19 is extended, as at 24 (Figure 4) to a point beyond the central runner bar 16, so that it overhangs the same, and one of the teeth is secured to this overhanging end, as at 23e. In order to provide clearance for the extended end 24, the end of the adjacent tooth bar on the other unit is modied by shortening it and by having its angular extension 25 bent downwardly and then upwardly, as shown in Figure 4, to provide a pivot arm in axial alignment with the angular extension 2G on the companion bar.

The frame construction and manner of mounting the tooth bars above described provides a iiexible structure in which the two lateral extensions or units composing the narrow may flex about a central longitudinal line, due to the loose pivotal connections of the inner ends of the tooth bars to the pivot pins 22, while the tooth bars may rock about their pivots on the brackets 18. The tooth bars on each unit are connected for simultaneous rocking movement by means of rocker bars 26 connected t0 upright arms 27 on the respective tooth bars.

Rocking of the tooth bars on both units to lift and lower the teeth is preferably effected simultaneously by means of a draft operated device such as described and claimed in patent to John son et al. 1,923,930, August 22,1933. This consists of forwardly converging links 28 pivotally connected at their rear ends to the respective rocker bars 26 and pivoted at their front ends to a slidable draft head 29 mounted on the forward portion of the tongue or slide barr13. This draft head has a clevis 30 secured to its forward end and is provided with ratchet teeth 31 cooperating with a latch lever 32 pivoted on a transverse pin connecting the bracket plates 14 and controlled by a pull cord 33 from the drivers position on the tractor. The clevis 30 is adapted for connection to a tractor drawbar 34. A pull on the cord releases the draft head 29 and the draft of the tractor will slide the draft head 29 forwardly between the parallel ends 12 of the converging bars 11., thereby rocking the tooth bars and lifting the teeth 23 from the ground. The runner bars 15 and 17 will then rest on the ground and permit easy transportation of the harrow. Reverse movement of the draft head will, of course, lower the teeth.

The construction described is one in which a iiexible type of spring tooth narrow is provided without necessitating the use of separate harrow frames as has heretofore been thought necessary, thereby providing a harrow which leaves no une. Worked strips of soil between sections and one which is easily manipulated and transported.

TD?. Rfflled @,Ilbodmm? disclosed, is Subject to modification' without departure fromthe eeepe of, the invention, es dened in the fellewing elf 'me' isr elemed is:

1,. In a pivot bar narrow,` a rigid transverse draft, member, outer and inner runner bars trailine leeeely from the draft member,` upright beefils brackets. ixed te the runner baltsend erraif'iged in transverse alignment at spaced points along said bars,V and s ets of axially aligned tooth CalrY-.g hars, PVQ'CEC On, Sad blflks .fofA T0015- ing movement on a transverse axis, two ofsaid alignedy tooth bars in each set being pivoted at their adjacent ends on the same bearing bracket.

2. In a pivot bar barrow, a rigid transverse draft member, three equally spaced runner bars pivotally connected respectively to the ends and the center of the draft member to trail therefrom, upright bearing brackets fixed to the runner bars and arranged in transverse alignment at spaced points along said bars, and axially aligned tooth carrying bars connected in pairs to the aligned brackets, the tooth bars of each pair having angular extensions at each end respectively connected pivotally to one bracket on an outer runner bar and to the bracket on the central runner bar for rocking movement on the same transverse axl-4 3. In a pivot bar harrow, a rigid transverse draft member, three equally spaced runner bars pivotally connected respectively to the ends and the center of the` draft member to trail therefrom, upright bearing brackets fixed to the runner bars and arranged in transverse alignment at spaced peints along said bars, axially aligned tooth carryingbars connected in pairs to. the aligned brackets, harrow teeth mounted in stag gered relation onv the respective tooth bars, an angular extension on the end of each tooth bar, said extension on each aligned pair of bars being respectively connected pivotally to one bracket on` an outerv runner bar and to the bracket on the central runner` barfor rocking movement on the same transverse axis, one pair of said tooth bars having one bar thereof overhanging the central runner bar, and a tooth mounted on said overhanging end.

ALEXUS C. LINDGREN. 

